Shape Shifters Demons in the Midst

Arianna Deeds world is turned upside down when she goes the angel academy. In a world with vampire, werwolves, and fallen angels are the least of her concerns, when demons try to take over earth. A thousand year treaty broken and a vampire virus running wild. Angels are becoming extinct. She must learn her powers or die. Will Arianna discover what's happening to the angel's or will she be next?